I'm dubious about the feet/melee measurement, as a melee is broken down into component units of initiative.

Look at it this way: lets say Rook and Wyvern Piss decide to race. Rook has a Run of 15, giving him a speed of 64 ft. per melee. Wyvern Piss has a Run of 8, giving him a speed of 48 ft. per melee.

The starting gun goes off, everyone rolls initiative as they get off the starting line. Rook is spot on with an initiative roll of 15. Wyvern Piss barely sees the gun go off and gets a 5.

Rook starts running at 15. Four seconds later (1 melee = 6 seconds, Wyvern Piss's 5 is a third of the total possible iniative of 15, so he gets 1/3 * 6 seconds, 2 seconds of the round to act) Wyvern Piss hauls ass.

However, they both move the sum total of their speed in feet/melee.

So in 6 seconds Rook has moved 64 feet, at a speed of 10 and 2/3 feet per second.

And in 2 seconds Wyvern Piss has moved 48 feet, at a speed of 24 feet per second.

This exposes two problems:

1) No matter what initiative is rolled, Rook will always win.

2) Wyvern Piss is faster than Rook.

If we want to go into greater detail with movement, we should really go to a Feet/Initiative measure, so for every "tick" on the initiative clock a PC can move X feet, combined with other actions, from the start of their initiative count.

It is, however, a whole lot of math per round in that case…